Spark plug



Aug. 19, 1924 1 1,5053 73 L. P. CARPENTER SPARK PLUG Filed Oct. 19. 19202E dar pani ET.

3 wumvboz age Q arfozueg Patented Aug. i3, 192%:

nane BOYD PINKNEF CARPENTER, OF PALESTINE, TEXAS.

SPARK PLUG.

Application filed October 19, 1920. Serial No. 417,580.

To all whom it may concern."

Be it known that I, LOYD PINKNEY CAR- PENTER, a citizen of the UnitedStates, residing at Palestine, in the county of Anderson and State ofTexas, have invented certain new and useful Improvements in Spark Plugs,tion. This invention relates to improvements in spark plugs.

An important object of the pnovision of a spark plug so constructed asto eliminate the constant necessity of cleaning the sparking parts ofcarbon deposits. A further object of the invention is the provision of aspark plug so constructed as to intensify the spark in order to explodea relatively low grade of combustible vapor. A further object of theinvention is the provision of a spark plug which has a plurality ofadjustable sparking points arranged to provide a relatively large degreeof surface over which the spark must travel to insure a proper ignitionof fuel. Other objects and advantages will be apparent during the courseof the following detailed description.

In the accompanying drawin s forming a part of this specification, an inwhich like reference characters designate like parts throughout thesame.

Figure 1 is a side elevation of the improved spark plug.

Figure 2 is a cross sectional view taken through the improved spark plugand showin the sparking arrangement.

%igure 3 is a bottom plan view of the spark plug showing the sparkingpoints.

In the accompanying drawings, wherein for the purpose of illustration isshown a preferred embodiment of my invention, the numeral 5 designates abody casing, formed preferably of standard spark plug construction andwhich has the screw threads 6 thereon adapted to be threaded into thehead of an internal combustion engine cylinder, and having the internalannular seat 7 there in. An insulating core 8 is provided, having theannular shoulder 9 thereon which is ada ted to vrest upon the annularseat 7 of the ody casing. It is preferr'edthat the insulating core 8difier from the ordina spark plug construction, in that the sides ofwhichthe following is a specificathis invention is invention herewithshown and 10 contact with the interior of the body ee sing 5 and thebottom 11 thereof is flush with the bottom 12 of the body casing, thuselimimating and insulating core and in which carbon is the cavityintermediate the casing sometimes deposited. A clamping nut 13 isprovided and adapted to bind against the shoulder 9 to maintain theinsulating core 8 in position with respect to the body casing. It ispreferred that the washers 14 be 6 provided intermediate the bindingpointsadjacent the insulating core 8.

The ,main electrode 15 is centrally disposed within the insulating core8 and has the screw threaded projection 16 thereon, provided to receivea thumb screw 17 for the purpose of clamping a terminal 18 of a cable 19which leads to a battery or the like. Upon the lower end of theelectrode 15, a multi-pointed head 20 is preferably integrally formed,and projects for a short distance from the bottom 11 of the insulatingcore. Neutral electrodes 21 are provided intermediate the head 20 andthe outer surface of the insulatin core and S'which are so situated thateac one of them has a respective grounded in the body casing 5 and whichproject from the bottom 12 of the casing 5 each having an inturned head24 arranged tangentially to the. plug axis, the upper edge of which justflush with the bottom of the main and neutrallelectrodes.

In the construction of the spark plugs here illustrated, it is-preferredthat the head 20 have five points thereon, co-acting with the fiveneutral electrodes 21 and which in turn co-act with the five groundelectrodes 23,

Since the insulating core 8 can be rotated within the casing 5, it canbe readily seen that the shortest distance between any neutral electrode21 and its respective ground electrode 23 can be or exciter of varyingvoltage can be used? and the spark plug adjusted to su'itthe voltij age.The spark thus produced within til/e cylinder will travel over aconsiderable distance, course from the main and to its respectiveneutral electrode 21.

It is to be understood that the form of my described is to be taken as apreferred point 22 at its shortest distance to the head. A plurality ofelectrodes 23 are varied. Thus, a battery;

example of the same, and that various changes in the shape, size andarrangement of parts may be made without departingfrom the spirit of theinvention or the scope ofthe subjoined claims.-

Iclaim:' a

1. A spark plug comprising a metal body casing, an insulating core, aplurality of ground electrodes carried by the casing in depending.relation therefrom, a main elec- .trode and then to the ground electrodeadjacent the same, said core being adjustable in-the body casing wherebythe distances between the ground electrodes and their respective neutralelectrodes may be varied. 2. A- spark plug comprising a .body casing, aninsulating core, a plurality of ground 30 electrodes carried by saidcasing independing relation therefrom having-their lower ends inturnedbelow the bottom of said core in tangential -.relation with respect tothe plug axis, a main electrode carried by said core having amulti-pointed head embedded."

in and depending below the bottom of said core and having a pointprovided thereon for each ground electrode, and neutral electrodesseparably carried by said core in insulated relation depending fromthebottom thereof. a neutral electrode being provided for each point ofthe main electrodehead, each neutral electrode having its respectivepointon the Inulti-pointed head located at the shortest distance betweensaid neutral electrode and said head, said core being movable in thebody casing whereby to vary the distance between the neutral electrodesand the ,inturned ends of their respective ground electrodes. I

LOYD PINKNEY CARPENTER.

